Mechanical movement



(No Model.)

P. J AOKSON.

MECHANICAL MOVEMENT. v No. 337,956. Patented Mar. 16, 1886.

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FFICFQ FRANCIS JACKSON, OF BAISINVILLE, MICHIGAN.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 337,956, dated March 16, 1886.

Application filed January 14,1886. Serial No. 189,504.

Z0 aZZ whom it may concern.-

Be it known that I, FRANCIS JACKSON, of Raisinville, in the county of Monroe and State of Michigan, have invented new and useful Improvements in Mechanical Movements; and I do hereby declare that the followingis a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to a new and useful improvement in mechanical movements, designated for the conversion of foot-power into continuous rotary motion; and the invention consists in the construction and arrangement of the parts, all as more fully hereinafter described.

In the drawings which accompany this specification, Figure l is a plan of my device. Figs. 2 and 3 are side elevations thereof, showing the parts in two different positions.

A and B are two treadles, arranged to 0p crate in the usual manner.

0 is a rock'shaft journaled upon a suitable frame, and provided with two cranks, D and E, each of which is connected by a rod with one of the treadles.

E is the driver-shaft, to which the power is applied. It is provided with the crank-wheel F, to which the power is transmitted from the rock-shaft O by means of the rock-arm G and the connecting-rod H, the latter of which is extended beyond the crank-pin.

.[ is another rock-arm on the rock-shaft C.

J is a connecting-rod.

K. is an oscillating beam or lever pivotally secured at L.

M M are two sliding rods engaging with the free ends of the oscillating lever K, and N N are little rollers secured to the free ends of the sliding rods M M.

These parts, being arranged and connected as described and shown, operate as follows: The rock-arm I reciprocates the connecting-rod J, and this latter communicates an oscillating motion to the lever K; but owing to a certain amount of lost motion in the connection between the rod J and lever K the latter receives only an intermittent oscillating motion, which alternatingly projects and withdraws the rollers N N into and out of the path of the connecting-rod H in such manner as to inter- (No model.)

fere with the motion of said connecting-rod, as hereinafter described.

It will be seen that the oscillation of the rock-arm G, the degree of which is indicated by the length of the dotted arrows, will, with the help ofafly-wheel,0, communicate a continuous rotary motion to the driver-shaft; but it will likewise be seen that whenever the rock-arm G and connecting-rod H are in a straight line, or nearly so,as shown in Fig. 2, the position of these parts is unfavorable to exert much power on the crank-pin, and it is here that the rollers N N are made to operate as fulcrums for the connecting-rod H, allowing the latter to operate as a lever. The roller N is on one side of the crank, and the roller N upon the opposite, and their movement is so timed that when the rock-arm G is about in the position shown in Fig.1, moving downward, the roller N is projected and forms a fulcrum for the connectingrod, which now acts as a lever and exerts the power to full advantage on the crank-pin for a part of the revolution until it is withdrawn. At the reverse oscillation of the rock-arm G (shown in Fig. 3) the roller N is projected into the path of the extension of the connecting-rod H,and, acting as a fulcrum,again permits the connecting-rod H to act as a lever to exert the power to full advantage on the crank-pin for a part of the revolution until it is again withdrawn.

It is obvious that the rollers N N can only serve to good advantage while the rock-arm G and connecting-rod are at very obtuse angles or in a straight line. As soon as these positions are fully passed, the operative fulcrum has to be withdrawn, as it would become an obstruction to the further movement of the connecting-rod.

The object of rollers for fulcrums is to reduce the friction,as the connecting-rod H has a constant displacement in the direction of its length.

My improved mechanical movement is of 95 especial benefit for converting treadle motion, as the power is very evenly applied, while less rise and fall of the treadles is required than with the crank-motion treadles.

NVhat I claim as my invention is-- 1. In a mechanical movement, the combination of the connecting-rod H, actuated in the manner described and having an extension beyond the crank-pin, and two fulcrums alternatingly projected into the path of the connecting-rod, to operate substantially in the manner and for the purposes described.

2. In a mechanical movement, the combination of the connectingrod H, rock shaft 0, rock-arm G, and fulcrums N N, arranged to move alternatingly into the path of the connecting-rod at a certain period of its travel, substantially as described.

3. In a mechanical movement, the combinalion of the connecting-rod H, rock-shaft O, treadles A B, rock-arm G, and the roller-fulcrnms N N, operated by suitable connection from the rock-shaft G to alternatingly project into the path of the connecting-rod, all arranged and operating substantially as described.

20 4. In a mechanical movement, the connecting-rod H, extended beyond thecrank pin and operatingin the man nerdescribed, in combination with the rollers N N, rods M, lever K, connecting-rod J, crank I, and rock-shaft C, all arranged to operate substantially as described.

5. In a mechanical movement, in combination, the rock-shaft C, the treadles A B, and their connection with said roclrshaft. the rockarm G, the connecting-rod H, the crank F on the drive-shaft, and the rollers N N, having an actuating-connection with the rock-shaft, which alternatinglyprojects them into the path of the connecting-rod, all arranged and operating substantially as described.

In testimony that I claim the above as my invention I hereuntoset my hand.

FRANCIS J AOKSON. \Vitnesses:

H. S. SPRAGUE. EDMOND J. ScuLLY. 

